James



@atten gisten @anni @fge JAMES A. WOODBURY, OF BOSTON, MASSACHUSETTS. Letters Patent lV'o. 63,351, dated March 26, 1867.,

IMPROVEMENT IN VAIVES FOR S'IVEAM ENGINES.

@its tlgrbnle nicht tu in tipa tttttr utuitmrh mating mrt at tigt sante.

Be it known that I, JAMES A. WYODBURY, of Boston, in the county of Suffolk, and State of Massachusetts,

have invented certain new and useful Improvements in Arranging and Operating the Valves of Steam Engines7 to etTect' a variable cut-off operated from the regulator, and that the following is a full, clear, and exact descrip-' tion ot' the same, reference being had to the accompanying drawings, making a part of this specication, in whichv Figure l represents an external view of one side of the steam cylinder and ofthe steam chests. i

Figure 2 represents a section through the same, taken at the red line :t :t ofiig.

Eigure 3 represents an end view of the cylinder and of the steam chests.

Figure 4 represents a cross-section through the steam cylinder and chests, taken at the red lineyy of tig. I.

Figure 5 represents a view of the exhaust ports, and shown as detached fronrthe'steam cylinder.'4

Figui-e6 represents diderentviews ofthe valves, also detached from their places.

Similar letters of reference where they occur in the several Egures denote like parts in all the drawings.

My invention consists in a valve so constructed and arranged in reference to the openings in the Walled ports upon, which it works as to enable me to regulate the movement of the induction valves, so as to cut ot the steam at any desired part ofthe stroke of the piston, without reference to the exhaust valves.

This arrangement of valves is especially adapted for a variable cut-oll`. The cam shown in the drawings has a fixed throw, and would more the valves a uniform distance at all times, but with a movement varied in speed. But I propose tol use any of the common andV well-known forms of variable or shifting cams, so as to get a variable cut-olifrorn the regulator or governor, and oneh that will vary the throw as well as the time in making` it. The valves Iare balanced, or'nearly so, and as such especially adapted toa variable cut-"oli, as they can be used ormov-ed with so little power that the governor will regulate the engine in the most accurate manner. The less motion the valve has, provided it is sutcientto open theports for the inlet of the steam, the more sensitive or quick will be the action of the governor, and the nearer perfect will be the action or regulation of the engine. This motion and action attain by having two or more ports upon each side of the walls, which are so constructed as to let the steam into all the ports at once by means of slants or inclines in the outside of the valves and a suitable opening in the centre and through'thetop of the'valve.

To enable others skilled in the art to make and use my invention, I will proceed to describethe same with `reference to the drawings.

A represents a steam cylinder, having the inlet chests and valves and valve ports, B, arranged upon its side, and .the exhaust passages, ports, and valves C underneath. D is a cam-shaft, which may be revolved from any part of the engine, and has upon it a cam, a, which as it revolves strikes alternately the valve-rods b b which areattached to the inlet valves c c and open them, said valves being c1osedby a springi, (one for each valve, but one onlyV being shown in the drawings,) after the cam leaves the rods respectively. When the ordina-ry shifting or changeable cam is used, then I would propose to pnt it on the governor' shaft, and work il; by the governor. e e are the exhaust ports or valves, communicating with the osha-ust pas'sagcE and exhaust-pipe F. The exhaust valves are operated from the main shaft by means of the rods ff. There are three openings or port-s, I 2 3, shown in the walls, which ports are controlled by the inlet and exhaust valves. These may be reduced to two, or be more than three, as may be found expedient; I prefer three as acting well in practice. The steam in the inlet passes through' an opening, z', in the top of the vulve as well as through openings at both of' its ends, gg. There are two sets of walled ports, 7L z, with three openings in euch side ofeach wall, said walls having a division, n, in them, so that there are twelve openings or ports altogether, which are covered, exposed, or controlled by each valve, c c', which inakc'an immense amount ot' steam way by a very slight movement ofthe valve. y

Having thus described the operation of my steam valve, what I claim, and desire to secure by Letters Patent, isv y The valve, constructed as described, arid arranged with `reference tothe openings in the walled ports upon which it works, substantially as described, which arrangement enables me to regulate the movement of the induction valves so as tovcut oi the steam at any desired part of the stroke ot` the piston without reference to 1 the exhaust la ves JAMES A. WooDBUnY.

` Witnesses:

A. B. Scrouenron, EDM. F. BROWN. 

